How many of you crack your knuckles? Ever wondered what causes that satisfying 'crack'? Well, its air bubbles trapped in a liquid between your joints and it takes about 20 minutes for the air to reappear.
Some of you might have had a wisdom tooth and it might have been an unpleasant and painful experience. Most of you probably wondered why it was even there. They are an outcome of evolution as our ancestors used to eat their food raw. This led to their teeth being worn down and wisdom teeth grew in place so that they could eat and chew their food. Nowadays, we cook our food, and our jawlines have receded as our brains grew bigger which has left no space nor use for wisdom teeth leaving them squished in a small place and us howling with pain.
When you breathe most of the air is going in and out of one nostril. Every few hours the job shifts to the other nostril and it goes on and on.
Have you ever gotten scared easily and wished that you didn't want that to happen? Well, a surgical procedure called amygdalohippocampectomy (Whew! That's quite a mouthful!) removes half of the brain's amygdala, and with it the patient's sense of fear. Weird huh?
Have you ever had a small pebble in your shoe and felt as if that was a rock instead? Yeah, that's because your foot is very sensitive and it has millions of nerve endings which makes it extremely tickly and sensitive.
Humans are the only animals with chins.
You are about 1cm taller in the morning when you first get up than when you go to bed. This is because during the day the soft cartilage between your bones gets squashed and compressed.
The tongue is covered in about 8,000 taste buds, each containing up to 100 cells helping you taste your food!
The human body has 2.5 million sweat pores.
You produce about 40,000 liters of spit in your lifetime. Or to put it another way, enough saliva to fill around five hundred bathtubs -eugh!
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